US3764045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt adhesive gun
Assignee: Ornsteen Chemicals & Textiles
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Filing: 1972-10-10
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Granted: 1973-10-09
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Expires: 1992-10-10
Abstract
Abstract A hot melt gun for use with a cartridge of thermoplastic adhesive and in which a bead of melted adhesive is forced out of a gun nozzle by pneumatic action for efficient high volume bonding. The gun includes apparatus preventing blockage of the air supply line which can be caused by the backup of molten adhesive within the gun, while not detracting from overall gun performance.
Inventors
- 👤 R Ornsteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:20
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/00523; B05C17/0054
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
197 words
A hot melt adhesive gun for use with a cartridge of normally solid thermoplastic adhesive, said gun comprising: a housing having a chamber adapted to contain a cartridge of normally solid thermoplastic adhesive; means for heating said chamber to a predetermined temperature to maintain said adhesive in a molten condition; nozzle means coupled to the forward end of said chamber and including a normally closed valve operative in response to a predetermined force of molten adhesive to permit the flow of adhesive from said nozzle means; trigger means adapted for coupling to a source of operating gas at predetermined operating pressure; means for venting said chamber to the atmosphere; and a pneumatic assemble including; a mounting plate sealingly attached to the rear end of said housing and confronting said chamber; a gas supply port disposed within said mounting plate and coupled to said trigger means; actuator means; and a sealing plate disposed in said mounting plate and connected to said actuator means and operative in a first position to isolate said gas supply port from said chamber and operative in a second position to provide a gas communication path between said chamber and said gas supply port.
Claim 2
Dependent Claim
197 words
A hot melt adhesive gun for use with a cartridge of normally solid thermoplastic adhesive, said gun comprising: a housing having a chamber adapted to contain a cartridge of normally solid thermoplastic adhesive; means for heating said chamber to a predetermined temperature to maintain said adhesive in a molten condition; nozzle means coupled to the forward end of said chamber and including a normally closed valve operative in response to a predetermined force of molten adhesive to permit the flow of adhesive from said nozzle means; trigger means adapted for coupling to a source of operating gas at predetermined operating pressure; means for venting said chamber to the atmosphere; and a pneumatic assemble including; a mounting plate sealingly attached to the rear end of said housing and confronting said chamber; a gas supply port disposed within said mounting plate and coupled to said trigger means; actuator means; and a sealing plate disposed in said mounting plate and connected to said actuator means and operative in a first position to isolate said gas supply port from said chamber and operative in a second position to provide a gas communication path between said chamber and said gas supply port.
Claim 3
Dependent Claim
103 words
A hot melt adhesive gun according to claim 1 wherein said actuator means includes a piston; spring means urging said piston into a normally retracted position to maintain said sealing plate in its first position; said actuator means being energized when the operating gas pressure applied to said piston is greater than the bias force exerted by said spring means thereby to drive said piston forwardly and move said sealing plate to its second position; said actuator means being de-energized when the gas pressure on said piston falls below said bias force, whereupon said spring drives said piston back to its first position.
Claim 4
Dependent Claim
69 words
A hot melt adhesive gun according to claim 2 wherein said sealing plate is operative to be driven to a third position intermediate said first and second positions in response to the initial application of operating gas pressure through said gas supply port caused by actuation of said trigger means; said third position being operative to establish a gas communication path between said chamber and said gas supply port.
Claim 5
Dependent Claim
66 words
A hot melt adhesive gun according to claim 3 wherein said sealing plate in its first position is disposed within a recess provided in said mounting plate; said recess having a peripheral surface cooperative with a confronting surface of said sealing plate to define a groove which flares outwardly toward said chamber and which functions as an aperture upon the establishment of said gas communication path.
Claim 6
Dependent Claim
87 words
A hot melt adhesive gun according to claim 4, wherein said pneumatic assembly includes a first gas supply line provided in said mounting plate and terminating in said gas supply port; a second gas supply line in fluid communication between said first gas supply line and said actuator means; said first gas supply line having greater fluid flow capacity than said second gas supply line; said first and second gas supply lines being operative for both supply and evacuation of operating gas to and from said chamber.
Claim 7
Dependent Claim
60 words
A hot melt adhesive gun according to claim 5 wherein the stroke of said piston, the relative fluid flow capacities of said first and second gas supply lines, the retraction time of said sealing plate, and the configuration of said aperture are predetermined to provide evacuation of said chamber to a selected residual pressuRe upon release of said trigger means.
Claim 8
Dependent Claim
57 words
A hot melt adhesive gun according to claim 2 wherein said nozzle valve includes spring means urging said nozzle valve into a normally closed position; said nozzle spring means having a bias force operative to permit opening of said nozzle valve at a pressure level intermediate the operating pressure in said chamber and the residual pressure therein.
Claim 9
Dependent Claim
64 words
A hot melt adhesive gun according to claim 2 wherein said nozzle valve includes spring means urging said nozzle valve into a normally closed position; said nozzle spring means having a bias force greater than the bias force of said actuator spring means such that during evacuation of said chamber said nozzle valve closes before retraction of said actuator piston to its first position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |